CTH200 Series PLC User Manual
8 Fault Diagnosis
CPU execute the following operations when faulted:
1）Get into STOP Mode
2）Light the SF/DIAG (Red) LED and STOP indicator up
3）Disconnect the outputs
Check the following conditions first:
CTH200 CPU and expansion modules are powered normally.
I/O terminals for CTH200 CPU and expansion modules are fastened by using screws and
connector.
Check the communication cable connect normally.
Adjust the Baud rate, Port or IP address if you still cannot find the PLC.
Except methods above, you can also read the diagnostic information from MagicWorks PLC, or
inspect the LED indicators for PLC internal and external exception.
8.1 Diagnose by MagicWorks PLC
The faulted status would last until the error cleared, then open MagicWorks PLC software →
double-click the project interface → select menu item“PLC”→“Information” to check the error
information.
Table 8-1 Diagnosis function
No fatal errors present; no error
HSC box enabled before executing HDEF box
Conflicting assignment of input interrupt to a point already
assigned to a HSC
Conflicting assignment of inputs to an HSC already assigned to
input interrupt or other HSC
Attempted execution of an instruction that is not allowed in an
interrupt routine
Attempted execution of a second HSC/PLS with the same
number before completing the first (HSC/PLS in an interrupt
routine conflicts with HSC/PLS in main program)
Indirect addressing error
TODW (Time-of-Day Write) or TODR (Time-of-Day Read) data
error
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